Battery charger



FIG. 1 is a front perspective view of a battery charger according to the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a back view thereof.

The broken lines in the drawings are included for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a battery charger, as shown and described. 